list_enum.rs

macro_rules! list_enum {
    ( $type:ident, { $($el:ident),* }  ) => {
        #[derive(Debug,Clone,Copy)]
        enum $type{
            $($el),*
        }

        impl $type {
            pub fn list() -> &'static[$type] {
                const LIST : &'static[$type] = &[$($type::$el),*];
                LIST
            }
        }
    }
}

list_enum!(Brand, {
    Dell,
    Asus,
    Sony,
    Panosonic,
    Apple
});

fn main() {
    println!("Brand::list() = {:?}", Brand::list());
    for brand in Brand::list() {
        println!("brand = {:?}", brand);
    }
}

// Brand::list() = [Dell, Asus, Sony, Panosonic, Apple]
// brand = Dell
// brand = Asus
// brand = Sony
// brand = Panosonic
// brand = Apple